Broach mechanism



Feb. 28,1928. 1,660,812

J. L. PERKINS ET AL BROACH MECHANISM Filed April '7, 192? ALL w. 7 1 am,

.A TTORNE Y.

' mechanisms Patented Feb. 28,1928.

. om n Ter- JULIAN L. rnaxms'on wns SPRINGFIELD, as]: HIIR'AM D. oRorT,or SPRINGFIELD,

MASSACHUSETTS, ASSIGNORS To PERKINS MACHINE AND GEA-R- COMPANYyOF.

$PRINGFIELD, MASSACHUSETTS, A CORPORATION 01E MASSACHUSETTS.

enema MEoHenIsM,

Application filed April 7,

Our invention relates to improvements in for carrying and holdingbreaches and moving them into and out of cutting position, and residesin a carrier adapted to be attached to the reciprocat ng element of abroaching machine, a holder for a line or lines of broaches, linkspivotally connected with said holder and pivotally mounted on eccentricmembers With which said carrier is provided, means to adjust s'a'ideccentric members, on their axes, an abutment or abutments for saidholder, actuating means for said holder, and means to secure thebreaches to the holder, together with such other parts and' members asmay be necessary or desirable in order to render they-mechanism completeand serviceable in every respect, all as hereinafter set forth."

.The primary object'of our invention to provide comparatively simple,yet-highly efs fici'ent, means forholdin'g and presenting a broachorbroaches for action'on the Work, andfor giving to said qbroach or'broaches, when desired, a lead or leadsthat can be varied at will andwith great minuteness,-

whereby it is possible to obtain the utmost accuracy and the greatestefiiciency With the broach or broaches with which this mechanism is,equipped. I Another object is to provide simple and entirely practical,means for moving the breach or broaches into the cutting field andremoving them therefrom, such means being operated to move the breachesinto the cut ting fieldbefore theyarrive at the Work, and

to remove them from said field after they have passed completely throughthe Work;

A further object eisvto supply'mechanism of this character with strongand entirely adequate means for securing the breaches or breach sectionsso fir'mlyand rigidly to the holder that any displacement of the same,except when released for removal is pre vented. V

Other objects and advantages will appear spindl'e2 i rovidedt with a r cl a o @1 i vents Fi -.12 a front elevatlon of an intermediate portlon1927. Serial -i 1"o. 181,842.

of said mechanism, which-includes the actu-" ating means for the broachholder, parts being broken away and aportionoftheoperating lever beingbroken out; Fi 3, an enlarged, fragmentary port on nsectijon of thecarrier, SllOWEIlg one of the eccentric membersmounted therein; Fig. 4,an e11larg'ted,-

top plan of the holder, one of the broach sections, and the clampingmeans therefor, and, F 1g. 5, a side elevation of parts'correspending-with those shown in the} preceding view.

similar parts throughout the several views,

Similar reference characters designate We have illustrated in connectionhreith, and willde'scribe, breach mechanism which is designed to beequipped with both roughingand finishing broaches,'fbut it'is to beunderstood that the number of breaches orlines of breaches is notmaterial, so far as the present invention concerned, inasmuch as theremay be one breach or one line of breaches, or

I ore than two breaches or two lines offbr' "ches.

7 Our mechanisf includes a ehanneledcaras an intermediate,v cylindricalportion Which forms an eccentric 3. Each spindle 2 has at oneend aprotruding angular projection 4 to receive thereon a sector 5 inwhich isa segmental slot, 6. Each sector 5 extends forzwardly from thep'rojectionjt on which itis mounted, alongside of the flange of the carrierv l which is on the same side with said sector, and a, bolt]? ispassed through said,

fiangefr'om the inside and through thes'lo't 6 inthe sector tojrecei veon its outer te'rm'ie nal a nut 8. vAlthoughbut one of these sectorsf,with its boltand nut, shovvniinthe" drawingaic is, .to be unde'rs oldand {clampin insane therefor ,U on loosening the nut .8 1 a v case,

associated sec or an'dlth'e spindle ape said sector is mounted can berotated in either direction to, Chan eccentric 3 on; ax1's, ;of saideccentric Qe .tli'

h pa t al of he die, and lo a' j tethe rearwardly asdesiredan'ditowniatver e i teeth of these breaches being arranged andconstructed to cut' on the down stroke, and

the finishing breaches being above the roughingbroaches, For these linesor sets of cutters 9 and 10 we provide a holder comprising a longsection 11 for the roughing cutters, a

. short section 12 for the finishing cutters,

and a connecting bar 13 between said sections,'theo'1: posite endportions of saidbar being attached to ad acent ends'ot saidsectionsbypins 141l. The end portions of the bar 13 are let into'rec'esses'in the adjacent end portions of the sections Hand 12',

with the hacker inner side-of said bar flush with the correspondingsides of said sections. The aforesaid recesses produce lugs 15 and .15,respectively, at adjacent ends of the holder sections 11 and 12. Thelugs 15 and 15 extend onto the front side of the bar 13,

and it is through said lugs that the pins 14 extend. C

A link 16 is mounted at the rear end on .BflCli of the eccentrics 3, andis pivotally connected atthe, opposite end with either the holdersection 11 or the holder section 12, as represented a't- 17, thecarrienl and both holder sections being recessed at 18 and '19,respectively, to accommodate said link and a ifordample spacesforwhatever movementon the part of the link is required.

An abutment block 20 issecured by bolts or other means in the top of thechannel in the carrier 1, above the holder section 12,

and an abutment block 21 is similarly secured in said channel, in irontof the bar 13 and abovethe holder section 11. The blocks orabutments 2O and21 are arranged to limit the upward movement ot theholder sections,

and receive the thrust imparted to said sec tions by the cutters whenmaking their ac-' arm 28 is rocked downwardly. The holder section 12 isformed with an "inset 22 to receive the finishing cutters 10 ti'vestroke.

and position them approximately in the lon gitudinal center, laterally,of said section, with their teeth projecting beyond the front edge ofthe'section, andeach of-said cutters is secured to the section by meansof a clamp 23 and a bolt 24. The'inner and outer major! planes of theclamp 23 are in angular relationship to each other, and thebolt2-i'passes through an opening in said clamp which is at right-anglesto the outer face thereof, and

is tapped intoan opening in the holder section12 at an angle whichcorresponds with the anglefof said opening in said clamp for the passageof said bolt. There, must also be an'oblique' opening in each cutter 10to receive the bolt after it passes through the clamp 23 and beforeentering the holder section. hen the bolt 24:, after being passedthrough the clamp 23 and cutter 10 into the holder section 12, istightened, it not only forces said clamp hard against said cutter,

so that the latter is tightly grasped between the contiguous surface ofthe inset 22 and that of said clamp, but also tends to force said cutterrearwardly or inwardly against the back end of said inset, and thus toretain the cutter securely 1n. place with its rear edge against saidback end.

The individual roughing cutters 9 are longer than theindividualfinishingcutters 10, and theformer are secured to the holdersection 11' by means of clamps 23 and bolts 24- in a similar manner asthe latter are secured to the holder section 12, exceptlthat less clampsand bolts are needed for the longer individual cutters.-

Journaled in a horizontal bearing-25, supported from a bracket 26securedby bolts orother means to one side of the carrier 1, on theoutside thereof, 1s a rock shaft 27..

Mounted on and secured to the outer end 0' y the rock shaft 27'is anoperating arm28, and

- mounted on andsecured to the innerv end of said shaft is an actuatingarm 29. The arm I 28' atits outer end is designed to be connected withmechanism (not shown) for intermittently rocking said arm and with itthe shaft 27 and the arm 29, first in one andthen in the v otherdirection. through a slot 30, in the side oi the channel in the carrier1 to which the bracket 26 is fastened, into a recess 31 in the holderbar 13.

When the arm 28 is actuated in one direction, the arm 29 is actuatedinthe opposite direction and carries with'itthe bar 13 and the connectedholder sections 11 and 12, and when said first-named arm is rocked inthe other direction, said second-named arm is rocked in the oppositedirection ag'ain'and carries with'it said bar and sections. Theabutments 20 and 21 limit the movement imparted to the breach holderat-the time the Means to limit the movement of the holder in theopposite direction is not-needed, because the breaches orcutt'ers arethen out of operative position andno end support for the parts isrequired, as is the casewhen said cutters are in operative positionandmaking their cutQ In practice, theholder 'sections 11 and12areadjustedto cause the cutters 9 and 10,

when in the cutting field to be projected a proper distance therein, andeither or both cutters to be 'provided'witha lead orleads ifand asnecessary,'by loosening the locking means for the spindles 2, partiallyrotating said'spindlesto the e'x'ten't required to ad- Vance or retract,by means of the eccentrics 3, and through the mediums of the links 16,

the sections 11 and 12, and then relocking,

said" spindles against further rotation: By this meansand in this mannerthe holder The arm 29 extends sectionia can be set sothat the broaches10 have a lead over the broaches 9; or both sets of breaches can be setso that the upper end has a lead over the lower end of each; and, in anyevent, thesection's l1 and 12 are set to enable the broach teeth to belocated exactlyin the cutting plane, when the cutters are in advancedand bioachii'ig position.

The cutters 9'and 10, as disposed in the firstview, are inanintermediate or neutral position, from which position they are movedinto active position when the arm. 28

is rocked downwardly, and into normal in active position when said armis'rocked upwardly. The arm 28 is rocked downwardly to locate the holdersections 11 and 12 against the abutments 21 and 20, respectively,beforethe carrierl is caused to descend. During the descent ofthe carrier 1the cuttersS) and 10 make their out. As soon as the cutters 10 clear thework, the arm 28 is actuated to carry the holder with said cuttersdownwardly in the carrier 1. This downward movement on the part of theholder and cutters is converted into a rearward movement through themedium of the links 16, and the 1 cutters are thus retracted from thecutting field, and they are not again advanced into said field until thecarrier 1 has ascended and is about or commences to descend to make thenext cut. Being retracted, at the,

of the parts of this broach mechanism may be made, without departingfrom the splrit' of our invention or exceeding the scope of what isclaimed.

What we claim as'our invention, and desire to secure by Letters Patent,is

1. In mechanism of the class described, members, one of which isadaptedto hold broaches, in sliding relationship, adjustable pivotalmeans carried by one of said members, and connections mounted on saidpivotal means and pivotally connected with the other of said members. i

'2. In mechanism of the class described, members, one of which isadapted to hold broaches, in sliding relationship, adjustable pivotalmeans carried by one of said members, means to lock and release saidpivotal means, and connections mounted on said pivotal means andpivotally connected withthe other of said members.

3. The combination, in mechanism of the class described, with a carrier,a broach holderin sliding relationship to said carrier,

and pivotal connecting means between said holder and carrier, of meanstomove said holder longitudinally on said pivotal means, theconstruction and arrangen'ientjof' parts bein such that the longitudinalmovement of said holder is converted into a movement,

j in the'direction 01in transverse dimension of sa d holder.

4,, Thec inbinati'On, iirn'iechanism oi the class described, with acarr1er,-a broach holder in slid ng relatlonship to saIdQcar rier, andpivotal connecting means between" i said holder and carrier, of means tomove said holder longitudinally OII saidpivotal means, the constructionand arrangement of parts being such that thelongitudinal movementof saidholder is converted intoanarcuate movement which positions the holder indifferent vertical planes.

5. The combination, in mechanismof the class described, with a carrierprovided with an abutment, a broach holder in sliding relationshiptosaid carrier, said abut: ment being in the path of said holder, andpivotal connectingmeans between said holder and carrier, of means tomove saidholder longitudinally on said pivotal means, the

construction and arrangement of parts be: ing such that the'longitudinalmovement of said holderis converted into a movement in the direction ofa transverse dimension of said holden,

6. In mechanism of the class described, a carrier, spindles providedwith eccentrics mounted insaid carrier, a broach holder slidinglyarranged relative to said carrier, links mounted on said eccentrics andpivotally connectedwith said holder, and means to actuate said holderlongitudinally.

7. In mechanism of the class described,

a carrier, spindles provided with eccentrics mounted in said carrier,means to lock said spindles against rotatlon and to release the same, abroachholder shdingly arranged relative to said. carrier, links mountedon said eccentrics and pivotally connected with said holder, and meansto actuate said holder longitudinally.

8. The combination, in mechanism of the class described, with a carrier,spindles provided with eccentrics mounted in said carrier, sectorssecured to saidspindles, means to hold said sectors against independentmovement after the same with their spindles have been partially rotated.for the I proper adjustment of said eccentrics, av

broach holder slidinglyarranged relative to sa d carrier, and hnksmounted on said eccentrics and pivotally connectedwith'said holder, ofmeans to actuate said holder lon-.

gitudi'nally. 7

9. The combination, in mechanism of the class described, with a carrier,a broach holder slidingly arranged relativeto said carrier, andlinkspivotally connected with said Carmel and with said holder, of a rockshai't mounted on said carrier, and provided with an arm in engagementwith said holder, and with an operating arm.

10. The combination, in mechanism of the class described, with acarrier, a broach holder slidingly arranged relative to said carrier,said holder-comprising upper and under sections and a connecting bar,and

links pivotally connected'with said carrier and with said sections, of abearing attached to said carrier, and a rock shaftjourna1ed in saidbearing, and having an operating arm and an arm in engagement vwith said7 bar.

- 11. The'combination', in mechanism ofthe class described, with achanneled and slotted carrier provided with abutments, spindles providedwith eccentrics and mountedv in said carrier; locking and releasingmeans for said spindles, a broach holder slidingly arranged in thechannel in said carrier, said holder comprising sections each locatedbe} low one of said abutm ents, and a connecting bar,' and. linksmounted on sald eccentr cs and plvotally connectlng with sald sections,

'of a bearing attached to said carrier, .a .rock shaft journaledin saidbearing andi having one terminal adjacent to the: slot in said carrier,an arm secured to said shaft-

